Lens-drill



J. MOFFITT.

LENS DRILL.

APPLICATION FILED Aus.9. 1911.

1,370,035. Patented Mar- 1, 1921.

2 SHEETS-SHEET lnew 63 l/Vl/E/VTOR JEE E 'MIAH MOFF'I TT ATTORNEYS.

' J. MOFFITT.

LENS DRILL.

APPLICATION FILED AUG.9, 1911.

1 370,035. .Pdtented Mar. 1, 1921.

2 SHEETS-SHEET 2- INVENTOR JEEE/Vl/AH MOF'F'I TT ATTORNEYS,

usa v I JEREMIAH raorrrrr, or sournsitrnen, MASSACHUSETTS, ASSIGNOR toAMERICAN orrroar cor/man or soo'rnsarnen,massacnosnrrs, A VOLUNTARYASSOCIA- TION or'MAs'sAoi-fwsnrrs.

i,sao,os5.

To all whom itmay concern Be it known that I, JEREMIAH Morr rr, acitizen of the UnitedStates,;res1d1ng at Southbridge, in the county ofWorcester and State of hl'assachusetts, have invented certain new anduseful Improvements inLens- Drills,- of which the following is aspecification. 7 1 I H This invention relates to improvements in drillsand has particular reference to ,an.

' mic lenses.

One or the leading objects of the present invention is the provision ofan improved construction in which the lens holder' or support may bereadily adjusted'for decentration purposes and for angular positioni ofthe lens to bring'the portion being drilled normal to the drill.

;A further object 01" the invention 1s the provision of improved meansfor automati- 3 1 s ti'on by the screw 17, which-projects inj wardlyfrom the member 13 adapted to ride" 1n the recessed portion"1 8joi thepost 10 cally securing the lens carriage in desired an ularly adjustedposition.

Other objects and advantages of my improved construction should bereadily apparent by reference to-the following speci-v ficationtaken inconnection with the accompanying drawings, and it will be understoodthat I may make any modifications in the specific details ofconstruction shown and described within the scope of the appended claimswithout departing from or exceeding the spirit of my invention. 1 1

Figure I represents afront view of my complete drill with the tabletilted. v

Fig. 11 represents an end viewthereof. Fig-.III represents a sectionalview with the parts in non-tilted position, taken as on the line'IIL-III of Fig. 1.]

Fig. IV represents a similar view of the parts in adjusted position. i a

Fig. V-represents a sectional view ason the line- VV of Fig. I.

Fig. "VI" represents a cross sectional view on the line VI-VI of F V.

Fig/VII represents a transverse sectional view of the lens holderbearing.

'Fig.i VIII represents a horizontal sec-'1 tional view through the lensclamp operat ing mechanism. a

, In the drawings, in which similar characters of reference are employedto denote corresponding parts throughout the several LENS-DRILL.

Specification of Letterslatent. V Patented Dia 1, 1921] Applicationfilerl'August 9, 1917. Serial No. 185,291.

views, the numeral 1 represents the base of my improved drill,having'rising from the" rear thereof the standard 2 provided withdrilling point 5, and on its upper end'the I pulley 6, around which andthe pulleys 7* carried by the standard 2, passes a belt 8 for dr1v1ngthesplndle and thus the drilling point 5. A handle 9. 'servestovertically shift the drill spindle t to move the drill into and out ofengagement withthe lens.

Rising. the base '1 immediately be neath the spmdle .4: 1s a postlObearing the" pin 11, on whichis swiveled thesleeve l2 p .70 circling thepost 10, the neckhaving at the conical shaped lens having thelowerflared cap portion'liirn v upper end the hardened supporting point 14.

Projecting rearwardly fromthe portion 13 are the ears 15, between whichare disposed thespring member 16 secured in po which thus serves tolimit the. swinging aboutthe pin 11. lhe purpose of this limit-- 7 drillso that the stop 19 at the upper end of the spring may always be inproper position to engage with the edge of the lens 20 to be drilled, aset screw 21 serving to 'force the stop 19 in toward the point 14against the action of the spring, or when; released allowing the springto force the stop-rearwardly 1 V away from the lens receiving point. Atthe opposite side of thebla'se plate '1 from the parts just described isa large boss or upwardly extending portion 22 having formed" downwardtherethrough the cy1indrical bore or'pa'ssage 23 adapted to receive thestud 24 having near its upper end the peripheral 25, above whichprojects the sleeve portion 26 mounted' -upon the Stud .24. Intermediatethe bo'ss 22 and flange. 25 is a ring 28 locl ed rigid with the boss,

as by the pin 29, and having in its upper edge a plurality of suitablydesignated: notches 30. A pivoted latch member 31 cara ried by thesleeve 26 and actuated by the spring 32 serves to engage with a selectednotch to lock the stud and sleeve in rela- 8 movement or swiveling ofthe sleeve"12 tively adjusted position. To readily secure the stud inposition andto permit of desired rotation thereof I may if desiredsecure to the lower end the shouldered washer 1 33 heldin position bythe screw 34 and having the pin 35 interlocking with the lower end ofthe stud so that the washer will turn therewith and liability ofloosening of the retaining screw be avoided.

It will be noted particularly by reference 7 to Figs. II and III, thatthe sleeve 26 is eccentrically disposed with respect to the studandyconsequently rotation of the stud and sleeve will serve to varythe'dlstance between the sleeve and any parts carried thereby and thelens supporting point 14,

the ainount of variation being denoted by suitable figures ormarksdisposed adyacent the several notches 30.

As is clearly illustrated in Fig. III for example, the socket in thestud and sleeve 26in place of being cylindricalin form is frusto-conicalor tapered, this socket 36 be-' :ing adapatedto receive the exteriorlytaperedsleeveor pintle 37 bearing at its upper end .the cylindricallycurved seat 38, on

whichrests the semi-cylindrical shaped slide 39 bearing the lenscarriage or holder 40, on which are mounted the pair of relativelymovable aw members 41 having the plurality of depending lens centeringpins 42 on whose heads are the lens 20. This shank of the pins, asdesired.

lens 20 is automatically centered between the pairs of pins 42 on theopposite j aws,

while said pins are provided on their lower ends with the heads 43 tolimit the downward movement of the lens while permitting of its upwardsliding on the body portion or A suitable handle 44serves to actuate thejaws and open them any desired amount, attention -being called to thefact that the size and? curvature of the jaws as illustrated in Fig. Iissuch as to permit of their receiving an extremely large lens, such as agoggle lens or the like. I V In the drillingof ophthalmic lenses it isextremely desirable that the lens be tilted to such position that thedrill point will act normal to the surface being drilled, and toaccomplish his result I suitably tilt the J len holding mechanism justdescribed in the manner illustrated in Figs. I and IV. To

facilitate this result I make use of the semicylindrical seat 38-andbearing member '39 slightly during the angular adjustment thereof. I V

To permit of this tilting movement as desired and at the same timereadily secure the parts in desired relation, I preferably employ themechanism illustrated in Figs. II and III, this mechanism consistingessentially in forming the pintle 37 with an interior chamber 45 tovreceive the spring 46 held by the pin 47 at the lower end and suitablysecured to the lens holder bearing 38 at the opposite end, this securingdevice taking the/form of a pin 47 or other desired connection.

The operation of these parts should best be understood by reference toFig. IV, from which it will be seen that the bearingmember 39 has anelongated slot formed therein, in which the securing spring46lmay rideduring tilting of the table so that the spring in no wise interfereswith the tilting move-. ment, the spring simply swinging about the pin47, while at the same time the tension of the spring pressing the member39 against its bearing 88 is sufficient to lock the parts in tiltedposition without additional mechanical locking members being employed.If desired, however, to supplement the retaining action of the'spring Imay'employ a latch 48 adapted to be engaged in the notch 49 near the endof the semi-cylindrical member'39, as shown in Fig. II, a suitablespring 50 serving to actu'ate'the latch into-locking position, while thelatch has itshandle portion projecting outwardly from the member 38 soit may be easily pressed inward and released by the thumb when the handis resting upon the lens holder 40 to unlock the latch and allow ofdesired tilting of the lens holder. y

In connection with this device I wish also, to call attention tothe'adustable pivot bearing or stop member, preferably in the form of ,ascrew. 51 at the lower end of the spin dle 37. This member it will beseen rides on the bottom of the tapered chamber or spindle receivingsocket 36, and is preferably so adjusted that the spindlewill just turnfreelyin the socket while the tapered fit of the parts prevents-anyrelative play.

As under use the parts loosen up it is merely necessary to slightlyadjust the pivot hearing 51 and allow the lens carriage to. move downwhen the tapered fit between the'socket and spindle will'again tightenup the relation of the spindle and socket and e1imi-. nate the playcaused by wear of these parts.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and use of my improved drill should bereadily apparent, and it will be seen that it is merely necessary toopen the jaws 41, as by actuation of the handle 44, when the lens 20 maybe easily placed in position between the pins 42 and pressed downward torest on their, heads '43, the operation of the structure in theserespects being in accordance with prior art usage, as shown for examplein patent to .Day, No. 807,064. The carriage is then set for normal orabove or below center drilling,

as desired, by rotation of ,thesleeve 26 andv associatedparts, andlocked by'engagement of the latch 31 in the appropriatenotch 30. Thelens carriage is then swung about the spindle 37 asa center inward untilthe edge the desired aperture. "The lens may then beturned over and theparts reversely tilted and the second side of the lens drilled.

Particular attention is called to the fact that by the use of thetapered spindle 37' and limiting pivot 51 these parts'may be readilyturned out according to standard specifications and may be quickly andeasily fitted into either old or new sockets and the parts whenassembled .jhave the necessary. rigidity and ease of pivotance requiredin a device of this nature. v f

Attention is also invited to the adjust ment which may be accomplishedin connec-' tion with thetilting, bearing to take up any wear of thecarriage and properly position the center of the automatic lenscentering mechanism beneath the drilling'point: This is accomplished, aswill be more clearly understood by reference to Fig. VII, through theuse of the pair of screws or similar type of fastening members 52 whichare engaged in the ends of the wall of the member 38 and have one sideof their heads bearing against the end of theslide 39. It will beunderstood that by loosening the member or members 52 at one end andcorrespondingly.

tightening the similar members at the opposite end that the slide may begiven a slight longitudinal adjustment in the bearing seat and thuscompensate for any wear in the parts or permit of the initial adjustment of the several parts of the machine into exact correct relation onewith the other.

In Fig. VIII, I have specifically illustrated the mechanism foractuatingthe jaws 41. This mechanism comprises the rock shaft or member 61journaled in the clamp arm carriage 40 bearing on its upper end thepinion 62 in mesh with the two rack portions 63 of the lens clamp jaws41, the said racks being disposed on opposite sides of the pinion sothat rocking of the handle 44 toward the left will open the jaws, and

reverse rocking of the handle will tend to close them. To facilitatethis reverse turning of the pinion and parts I may secure to the pinionthe spring 64 having its other end suitably secured to the member 40 sothat separation of the jaws will place the spring under tension and uponrelease of the handleithe spring will again'closethe' jaws, clamping thelens position thereb'e tween.

'lclaimz p 1. A device of the character-described, in

cluding a base, a drill standard and drilling spindle supported-thereby,a'socketed memi her rising from thebase, a taper spindle rotatablyengaged in thesocket of said memher, a bearing carried by the spindle, alens holder having a bearing interlocking with thespindlebearing,andmeans for fricti0n-. ally forclng "the bearings into el'igag'eme'nt 1one with the other to automatically securethe parts in desiredadjusted'position' on their bearings.

2 A lens cutter including a base, a post" rotatably mounted on'the'base', means'for locking the post in desired rotatably ady justedposition, an ec'centrically"disposed socket collar carried by the'postandadju'stable by rotation thereof, a spindle engaged in the socket andprovided witha head of arcuate shape in cross section, a lens clampmember having an arcuate portion fitting the head, a tension-springhavin'g'one end.

secured to the lens clamp member and the other to the spindle fordrawin'g the. two arcuate surfaces together, and means for locking thesurfacesin desired relation.

3.;In adevice of the character described,y

the combination with alens holder, of bearing carried thereby, a secondbearing frictionally engaged with the first, a base, means rising fromthe base to support said second bearing and a spring carried by one ofthe bearings and engaging the other for drawing the parts intofrictional locking engagement one with the other. 7 f 4. In a device ofthe character described, the combination with a base, of a rotatablyadjustable stud carried by the base and having a taper socket, a lensholder having. a taper spindle rotatably engaged in .the socket, and anadjustable pivot member carried by the spindle and engaging the bottom5. In a device of the character described,

the combination with a rotatable stud, having a sleeve carried. therebyand also having an eccentric socket, a spindle rotatably mounted in saideccentric socket and laterally adjustable by rotation of the stud andsleeve, said spindle having a bearing, a lens holder having a secondbearing interengaging with the bearing on the spindle, the spindlehaving a central socket formed therein and a spring fitting in thesocket'in the spindle and having one end secured to the spindle and theother end to thelens holder for pressing the bearing surfaces of the twobearings into frictional engagement one with the other, substantially asand for the purpose described.

'6. In a device of the character described, the combination with arotatable stud, having a sleeve carried thereby and also having aneccentric socket, a spindle rotatably mounted insaid eccentric socketand laterally'adjustable by rotation of the stud and sleeve, saidspindle having a bearing, a lens holder having a second bearinginterengaging with the bearingon the spindle, the spindle having acentral socket formed therein and aspring fitting in the socket inthe'spindle and having one end secured to the spindle and the other endto the lens holder for pressing the bearingfsurfaces of the two bearingsinto frictional engagement one with the other, and a latch member forsupplementin the action of the spring and positively loc ing the twobearings in relatively adjusted relation.

7. .In a device of the character described,

- the combination with a base, of a boss rising therefrom, aguide ringlocked on the boss, a flange member having a depending stud rotatable inthe boss and a sleeve projecting above the flange, the ring beingdisposed about the stud between'the ring and flange,

said ring having a plurality of notches formed in its upper edge, thesleeve being eccentrically disposed as respects the stud whereby thesleeve is laterally shifted by v rotative movement of the flange memberand the spring pressed latch member intermediately pivoted to the flangemember, and having a depending lower end adapted to be"; selectlvelyengaged in the notches of the ring, and a spring pressed upper actuatingend adapted to be pressed inwardlyctoward the sleeve to disengage thelower end from,

said notches, substantially as illustrated.

8. In a device of the character described,

the combination with a cylindrical bearing,

of a support therefor, a lens holder having a slidable bearing engagingthe first mentioned bearing, a spring tension device for holding theparts in frictional engagement one with the other, andsupplemental'means I,

a slidable bearingengaging the cylindrical 7 bearing, a spring forholding the parts in frictional engagement one with the other, and meansfor relatively longitudinally shifting said parts, substantially as andfor i the purpose described. V

In testimony whereof I haveafiixed my signature in presence of twowitnesses.

H. K. PAR'SQNS, E. M. LAFLER.

